Knob-grinding machine.



A. J. SANFORD.

KNOB GRINDING MACHINE.

APPLICATION FILED SEPT. 12, I914.

Patented Dec; 31, 1918.

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W/ZFQM A. J. SANFORD.

KNOB GRINDING MACHINE.

APPLICATION mu) SEPT. 12. m4.

1,289,92Qu Patnted Dec. 31, 1918.

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WITNESSEQ Tie/mu WKWZZ A. J. SANFORD. KNOB GRINDING MACHINE.

APPLICATION FILED SEPT. 12, m4.

1 ,%89,92%, Patented Dec. 31, 1918.

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NDREW J. SANFORD, or NEWARK, OHIO, ASSIGNOB, To A. H. HEISEY & 00., or

" NEWARK, OHIO.

KNOB-GRINDING MACHINE.

Specification of Letters Patent. Patemtmd Dec. 31, 19118.

Application filed September 12, 1914. Serial No. 861,418.

To all whom it may concern:

Be it known that 1, ANDREW J. SANFORD, a citizen of the United States,and resident of Newark, in the county of Licking and State of Ohio, haveinvented a new and useful Improvement in Knob-Grinding Machines; and Ido hereby declare the following to be a full, clear, and exactdescription thereof.

My invention relates to knob grinding machine or to a machine forgrinding and finishinga spherical face on the top of a knobfusually theknob of a bottle or jar, but it is equally adapted for finishing theends of door knobs and the like made of glass. The invention alsocontemplates forming not only a convex spherical. face on objects ofthis character, but also forming a concave spherical face on glassarticles where such form of face is desired. A further object of theinvention is to provide means for operating upon a plurality of objectssimultaneously. A. further object is to provide such means that by theoperation thereof spherical faces of great accuracy and uniformity maybe formed on the several obje ts.

With these and other objects in view as will appear from the followingdescription,, the invention consists in the construction and arrangementof "parts, a preferred embodiment of which is illustrated in theaccompanying drawing, in which Figure 1 is a front elevation of so muchof the machine as is necessary to illustrate the arrangement of theparts; Fig. 2 is a section on the line f 22, Fig. 1, looking in thedirection of the arrow; Fig. 3 is a vertical sectional view of one ofthe knobgrinding chu ks and the operating parts therefor; Fig. 4 is ahorizontal se tional view on the line 4- 4, Fig. 2; and Fig. 5 is a viewpartly in section "of a modified form of the invention for grinding aconcave spherical surface.

In the embodiment'of the invention illustrated in Figs. 1 to 4inclusive, 11 indicate the lateral standards of the machine, in thelower part of which is journaled shaft 2 driven by a\belt 3 on the fastand loose 'pullevs 4 and 5 respectively. On this shaft are fixed thegrinding wheels 6, here shown four in number. The fa e of each wheel asshown in Fig. 1 is concave as at 7, in

' order to grind a convex spherical face on the article to be finished.Above each wheel regulate a gear 28,

is mounted a chuck head 7, each of. which is provided with a cylindricalboss or so'ket 8 Within which the outer end of a rocking sleeve or shaft9 is fixed by a set screw 10. This hollow rock shaft or sleeve 9 isjournaled in bearings 1l 11 formed on an ad justable framework 12. Thisframework 12 is adjustable vertically in a bracket 13 secured to a crossbar 14 at the front of the main frame of the machine (see Fig. 2). Asshown in Fig. 4, the frame 12 has beveled side edges 15held indovetailed guideways 16-16, the latter of which is detachable as by bolt17 to facilitate the mounting of the frame in the' guide-ways. Theadjusting screw 18 threaded through a lug 19 of the stationary bracket13 and the upper edge of the screw 18 is provided with a hand wheel 20by which the adjustable frame may be adjusted up and down to theposition of the chuck-head 7 with respect to the grinding wheel 6, sothat articles of different size may be ground to the proper curvature.

In order that a spherical surface may be ground on the knob or otherarticle by means of the grinding wheel 6, it is necessary that thechuck-head be rocked from side to side with respect to the grindingwheel, and at the same time that the knob or other article he revolvedin a plane at right anglesto its axis. With these ends in view, thechuckvhead' shaft 9 has atta hed thereto a ro king arm 21, the outer endof whi h is conne"ted by a rod 22 and an eccentricstrap 23 with ane-centric 24 fixed to a shaft 25 journaled in a bearing sleeve 26 at theupper-end of the adjustable frame or bra ket 12. The rearend of theshaft 25 is provided with a gear 27'meshed in with slidably fixed on avertical shaft 29. This shaft" 29 is also provided with a beveleddriving gear 30. whi h is splmed to the shaft and is slidably mountedthereon, and is held in mesh with a gear 31 on the shaft 32 by meanscarried by the frame arm 34. The shaft 32 is journaled in bearings 35 onthe frame arm 34 and has at its forward end a worm gear 36 driven by aWorm 37 fixed to a transverse shaft 38 journaled in bearings 39 at thetop of the machine frame. The shaft 38 is driven by a pullev 40connected by belt 41 with a pulley 42 fixed to the main guide of asupporting sleeve 33 shaft 2. Thus it will be seen that as the ma hineoperates, the entire chuck-head 7 will be rocked transversely of theadiacent grinding wheel 6. In order to produce a true spherical surfaceon the article ground, it is necessary to provide the gear 28 with oneor twomore teeth than the gear 27 in order to vary the rocking movementof the chuckhead slightly with reference to the rotary movement of thechuck as hereafter described; otherwise, the cut would be somewhatconical. In order to give the required rotary movement to the chuck andreferring particularly to Fig. 3, it will be found that the chuck-head 7is provided with a bearing sleeve 43, having an integral ballrace 44 atits lower end and an adjustable ball race 45 threaded to its upper end,said adjustable ball race is fixed in position on the outer end of theshaft 53 is provided with a beveled gear wheel 54, which in turn mesheswith a beveled gear 55 fixed upon the vertical shaft 29. It will beseen, therefore,

that as the machine operates, the chuck sleeve 51 will be constantlyrotating.

In order to hold the work firmly within the chuck-head, a chuck 56 isprovided, on

. the outer periphery of which are formed locking ribs 57 whiz h asshown in Fig. 4, engage between corresponding locking ribs 58 formed onthe inner wallsof the chucksleeve 43. The chuck 56 is provided at itslower end with a socket or work-receiving recess 59, within whi'h ismounted a plurality of clampingarms 60, the inner ends of which arerecessed at 61 to engage the adjusting disk 62 fixed to the lower end ofa spring held rod 63. Upon the upper end of the rod '63 is fixed asleeve64 forming an abutment for a (oiled spring 65, the opposite end ofwhich rests upon an angular shoulder 66 in the bore 67 of the chuck 56.The spring tends normally to withdraw the rod 63 within the bore 67 ofthe chuck. Surrounding the lower end'or opening of the work-receivmg andclamping recess 59 of the chuck 56, may be mounted a stop ring 68, whichmay be composed of rubber or other comparat1vely soft material. It Willbe seen from an lnspectlou of Fig. 3, that tile bore or diameter of thework-re'eiving recess 60 of the chuck 56 is so small that when theclamping fingers 60 are drawn within this recess they tend to collapse.The work, which in Fig. 3 is represented as a glass knob 69, is providedwith a flange or head 70 which may be en gaged by the hook shapedouter'ends 71 of the clamping fingers 60, so that under thepull of thespring 65 of the chuck, the clamping fingers 60 together with theworkheld thereby will be' drawn within the work-re.

firmly to permit the work to undergo its rocking and turning movementsduring the grinding operation. For, pieces of work of considerablygreater or less diameter than that here shown, it is merely necessary tosubstitute in the chuck-head a chuck having a recess of'greater or lessdiameter as the case may be. Small variations of'the diam,- eter of thework, however, may be taken care of in the same chuck.

Should it" be ne"essary to'rough'grind the work before the finishingoperation, abrading sand or other material may be supplied to thegrinding face of the grinding wheel 6 by means of a pipe 72, Fig. 3,leading from a suitable source of such material. e

When the machine is used for grinding convex spherical faces upon thework, it will be noticed that the center of oscillation or rocking ofthe work must be above the surface being finished, or above the grindingface of the grinding wheel. When-it is desired to grind a concavespherical face on the work, it is necessary that the center ofoscillation be below or outside the portionof the work being operatedupon, and below or within the circumference of the grinding wheel. Alsoin grinding 'a concave surface,

the grinding face of the grinding wheel must be convex transverselyinstead of concave as heretofore described.

An apparatus embodying means for con.-

cave grinding is indicated in Fig. 5 in the drawing. The parts of thisapparatus are in many respects the same as those heretofore des ribedexcept that the ro"king sleeve 73 instead of lying above theircumference of the grinding wheel, lies within or below saidcircumference. The grinding wheel 74 in this case has a convexcircumference instead of a concave circumference as heretoforedescribed. This together with the fact that the rocking sleeve 73 isbelow 01 extends along a line within the circumference of the grindingwheel, produ"es a concave surface in the article ground instead of aconvex surface as heretofore described. The mechanism of Fig. 5 is,of'course, provided with the same rocking mechanism-such as the lever 21and rod 22as that illustrated 'in conne tion with Figs. 1 and 3. It mayalso be desirable to vary the size or diameter of the concave cutting;that is to say, make the concavity aeaeaa deep or shallow as the casemay be. To this end the sleeve 7 3 is pinned or secured at 74 to aboxlike bracket 75, having a journal bearing in the bottom thereof for ashaft 7 7. A gear 7 8 fixed on the inner end of the shaft 53 meshes witha gear 7 9 fixed to the shaft 77. Adjustably mounted on suitableguideways 80 and 81 of the lower bracket 7 5 is an upper boxlike bracketmember 82 within a bearing 83 of which is journaled a sleeve 8& of thechuck-head 85. In order to rotate the chuck in the chuck-head, a shaft86 corresponding to shaft 53, Fig. 3, is journaled in the chuck-headsleeve 84. The end of the shaft 86, which projects into upper adjustablebearing bracket 82, has fixed thereto a gear 87 which meshes with a gear88 splined on the upper end of the shaft 77. The gear 88 is free toslide on said shaft 77, and the upper bracket member has fixed theretoan arm 89 which slidably engages the shaft 77 and supports the gear 88in adjustable position thereon. It will be seen, therefore, that theupper bearing bracket 82 may be adjusted up and down with reference tothe axis of the rocking sleeve 73 so that the radius of the arc movementof the chuck-head 85 may be varied. This obviously in conjunction withthe curvature of the circumference of the grinding wheel 74, will varythe diameter of the concavity of the face of the article to be ground.

While I have herein described various preferred embodiments of myinvention, it is to be understood that the invention is not limited tothe construction and arrangementof parts herein described, but may bevaried in detail within the scope of the appended claims.

What I claim is:

1. In a grinding machine, the combina tion with a grinding wheel havinga trans versely curved grinding face, and means for driving said wheel,of a work holder having actuating connections for rocking the worktransversely of said wheel and for simultaneouslyrevolving the workonits own axis to grind a spherical surface on the work, and means foradjusting said work holder toward and from said grinding wheel.

2. In a grinding machine, the combination with a grinding wheel, havinga transversely curved grinding face and means for drivin g said wheel,of a work holder, comprising a chuck-head, a rock shaft fixed to saidhead, actuating connections for said rock shaft, a revoluble chuckmounted within said head, an actuating shaft mounted within said rockshaft and adapted to revolve said chuck, an

operating connection for rocking and rervolving the work in synchronismto form aspher cal face on the work.

In a grinding machine, the combination with a. plurality of grindingwheels, each having a transversely curved inding face,

- volving means respectively,

and means for operating said wheel, a work holder for each wheel, andoperative connections for rocking said work holder and revolving thework on its axis, all of said operating connections beingconstructed andarranged to operate in synchronism to'form spherical faces on each pieceof work simultaneously and uniformly, and means for ad justing ofwsaidwork holders independently with respect to its grinding wheel toaccommodate pieces of work of different size and to vary the diameter ofcurvature of the ground face.

4. A work comprising a chuck-head, having a rock shaft fixed thereto, achuck sleeve rotatably mounted within said head, said sleeve having agear attached thereto, a shaft mounted Within said rock shaft, a gearcarried by said second shaft and meshin with said sleeve gear, a workholding chuc removably mounted within said sleeve and havinginterlocking meanswith said sleeve to cause said chuck to revolve withsaid sleeve, said chuck having spring actuated arms to grip the work andhold the same against rotating with respect to said chuck.-

5. In a grinding machine, the combination with a grinding-wheel having,a curved grinding surface and means for driving said holderfor agrinding machine wheel, of a work-holder having means for rocking thework transversely of the grinding surface of the wheel, and means forsimultaneously revolving the work on its own axis while in engagementwith the wheel in order to grind a substantially spherical surface onthe Work, said revolving means and said rocking means being sorelatively arranged as to continually vary the presentation of thesurface to be ground to the grinding-wheel.

6. In a grinding machine, the combination with a grinding-wheel having acurved grinding surface and means for driving said wheel, of awork-holder for rocking the work transversely of said means forsimultaneously revolving the work on its own axis while in engagementwith said surface, said rocking and revolving means being so constructedand arranged as to varv the presentation of the work to the grindingsurface to produce. a spherical surface on the work.

7. In a grinding machine, the combination with agrinding-wheel having acurved grinding surface and means for driving said wheel, of awork-holder having means for rocking the work transversely of saidgrindin'g surface, and means for simultaneously revolving the work onits own axis, common means for operating the rocking and retheconnections of said common driving means with said rocking and revolvingmeans respectively being so synchronized as to vary the presenta- 119grinding surface, and

'tion of the Work to the grinding surface in a way to produce aspherical surface on the Work.

, 8. In a grinding machine, the combination with a grinding-Wheel havinga' curvedgrinding surface and means for driving said "Wheel, of aWork-holder having means for necking the Work transversely of thegrindlng surface, and means for simultaneously 3 revolving'the ork onits own axis While in engagement With-the grinding surface, the rockingaxispf the work beingjooated cm a line extendmgbetween the grmdingsurface of the Wheel and the center of the Wheel.-

In testimony whereof, I the said. ANDREW 1 J. SANFORD, have hereunto setmy hands ANDREW J; SANFORD. Witnesses: v

H. C. MUELLER, J. P. Goonwm. I

